[sdiy] ot: 2b-or-not-2b was:audiophile cones

[Magnus Danielson]

From: harry <harrybissell at prodigy.net>
Subject: Re: [sdiy] ot: 2b-or-not-2b was:audiophile cones
Date: Sat, 27 Jan 2001 21:40:29 -0500

> Re... speaker coupling
> 
> Now maybe you want the room involved in the bass... maybe not.  The optimum
> position for speakes in a rectangular room is (aprox) 1/5 the length of the room
> AWAY from the wall, 1/3 the width of the room apart, and 2/3 (or 1/3 for sitting)
> the height of the room.
> 
> This reduces standing waves (usually) to the greatest degree.  There are simulation
> programs that can help tune this...

We argue from diffrent positions... unarguably! ;)

I did not consider the standing waves abit, I considered radiation volume.

> Your wives  (that's you plural, group... unless you live in utah?)
> will kill you if you try this placement.

Hmm... or is it in sequence?

> Another solution is to chop holes in the wall, and mount the speakers flush... can't
> 
> be no back reflection because there's no back. The wall is effectively an extension
> of the baffle board.  My small 13' x 13' x 6.5' studio does this... I cannot afford
> to be
> away from the wall....

Certainly a good choice. Some speaker manufactor have avoided the
problem with reflections at the edges by rounding them off. Genelec
1022B is the extreme example.

> Magnus pointed out the bass enhancement by locating at a wall (slight)  wall/floor
> (moderate) or corner (large).  Do you want this...?
> 
> If you want good accurate bass... stay away from the corners. Get
> good speakers and locate at the optimum points.

The gain is allways there.

> Have small (cheap perhaps?) speakers... go for the corner.
> 
> The foam and mass approach I mentioned is good for decoupling the speakers from
> the structure (building). To work without screwing up the bass... the mass has to be
> 
> (er....) massive.  A sheet of foam, a piece of plywood... a layer of paving stones
> (concrete) to crush the foam into some compression... another piece of wood
> (don't want to scratch them speakers....).  If that won't do it... repeat the
> process.
> The bass will be fine (in your room) and will be MUCH better in the flat below
> yours...

Which reminds me, I'm living in a house and not in a flat.

You don't want sound to be creeping around in the building if you live
in a flat, because it might mean that you soon ain't living in a flat.

It is hard enougth to live in a house you know ;)

> Some speakers (Klipshorn) for one... use the wall as the final flare of a horn
> loaded cabinet. These MUST be in the corners !

Yeap, they really want to be up in them corners... and they do have a
"big" sound comming with them.

The hard part with a system is to decide where it ends and how much
you should consider "to be in it".

Cheers,
Magnus